WebView加载HTML表单并通过javascript提交
使用android的WebView控件加载HTML表单，通过javascript调用java对象提交表单，在java对象中获取表单的值：import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.os.Bundle;import android.os.Handler; import android.view.View;import android.webkit.JsResult;import android.webkit.WebChromeClient;import android.webkit.WebSettings;import android.webkit.WebView;import android.widget.Button;import android.widget.TextView;public class WebViewTest extends Activity { private WebView mWebView = null; private TextView txtView = null; private Handler mHandler = new Handler(); /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mWebView = (WebView) findViewById(R.id.webView); txtView = (TextView) findViewById(R.id.webViewResult); WebSettings webSettings = mWebView.getSettings(); //不保存密码 webSettings.setSavePassword(false); //不保存表单数据 webSettings.setSaveFormData(false); webSettings.setJavaScriptEnabled(true); //不支持页面放大功能 webSettings.setSupportZoom(false); mWebView.addJavascriptInterface(new LoginJavaScriptImpl(), "loginImpl"); mWebView.setWebChromeClient(new MyAndroidWebClient()); ((Button)findViewById(R.id.btnLoadhtml)).setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { mWebView.loadData(createWebForm(), "text/html", "UTF-8"); // mWebView.loadDataWithBaseURL("", createWebForm(), "text/html", "UTF-8", ""); } }); } private String returnValue; protected final class LoginJavaScriptImpl { public void login(String username, String password){ returnValue = username + ": " + password; mHandler.post(new Runnable() { public void run() { txtView.setText(returnValue); } }); } } private final class MyAndroidWebClient extends WebChromeClient { @Override public boolean onJsAlert(WebView view, String url, String message, JsResult result) { new AlertDialog.Builder(WebViewTest.this) .setTitle("提示信息") .setMessage(message) .setPositiveButton("确定", new DialogInterface.OnClickListener() { public void onClick( DialogInterface dialoginterface, int i) { } }).show(); return true; } } private String createWebForm(){ StringBuffer sb = new StringBuffer(); sb.append("<html>").append("<head>"); sb.append("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\"/>"); sb.append("<title>").append("表单测试").append("</title>"); sb.append("</head><script language=\"javascript\">"); sb.append("function checkform(){var username=document.loginForm.username.value;"); sb.append("var password=document.loginForm.password.value;"); sb.append("if(username==\"\"){alert(\"用户名不能为空！\"); return false;}"); sb.append("if(password==\"\"){alert(\"密码不能为空！\"); return false;}"); //sb.append("return username + \":\" + password;"); sb.append("window.loginImpl.login(username, password)"); sb.append("}"); sb.append("</script>"); sb.append("<body>"); sb.append("<form method=\"post\" name=\"loginForm\">"); sb.append("<table>"); sb.append("<tr>"); sb.append("<td align=\"right\">").append("用户名").append("</td>"); sb.append("<td").append("<input type=\"text\" name=\"username\">").append("</td>"); sb.append("</tr>"); sb.append("<tr>"); sb.append("<td align=\"right\">").append("密 码").append("</td>"); sb.append("<td").append("<input type=\"password\" name=\"password\">").append("</td>"); sb.append("</tr>"); sb.append("<tr>"); sb.append("<td align=\"center\" colspan=\"2\">"); sb.append("<input type=\"submit\" value=\"登录\" onclick=\"checkform();\">"); sb.append("&nbsp;&nbsp;<input type=\"reset\" value=\"重置\">").append("</td>"); sb.append("</tr>"); sb.append("</table>"); sb.append("</form>"); sb.append("</body>"); sb.append("</html>"); return sb.toString(); } } 在手机模拟器加载的表单页面：
http://dl.iteye.com/upload/attachment/430360/82726673-44f3-3788-99f5-abc98ed6c8c5.jpg
在创建的HTML页面代码的javascript代码中，有window.loginImpl.login(username, password)用来提交表单传递参数。其中loginImpl为java代码中自定义的接口的名称：
mWebView.addJavascriptInterface(new LoginJavaScriptImpl(), "loginImpl");
MyAndroidWebClient类这里的作用主要是用来显示表单校验提示信息。
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初学，才知道LogCat视图中无法显示中文，刚开始不知道LogCat里无法显示中文，我还以为提交表单后后台java里获取到的汉字为乱码，感谢朋友的提醒！
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